Heart Stone of the Wave Keep

An entry in the tenfootpole Wavestone Keep contest! From the publishers blurb: Terror grips the coast. Tavern boil over with rumors of mysterious reptilian reavers raiding fishing villager and sinking merchant vessels. But these are no ordinary pirates, they op0erate out of a floating tower that appears out of the night and moves against the tides. This impossible story is make even more improbable as it is said the tower is topped with a great ghostly eye that rains down fire upon its foes.